For this pattern you will need (100g Balls) :

Jumper Dress

22in Chest - 3 Balls
24in Chest - 4 Balls
26in Chest - 4 Balls
28in Chest - 5 Balls
30in Chest - 5 Balls
32in Chest - 6 Balls

Slipover

22in Chest - 1 Balls
24in Chest - 2 Balls
26in Chest - 2 Balls
28in Chest - 3 Balls
30in Chest - 3 Balls
32in Chest - 4 Balls

Needles Needed: 6mm and 5mm. 
Cable Needle for dress.
Safety Pin for Slipover.
Stitch Holders.